/*
- * Parse and validate C declarations.
- * Copyright © 2011 Nick Bowler
+ * Parse and validate C declarations.
+ * Copyright © 2011-2012, 2020-2021, 2023 Nick Bowler
*
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
*
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
*
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
+
#include <config.h>
#include <stdio.h>
#include <assert.h>
#include <stdbool.h>
#include "cdecl.h"
-#include "typemap.h"
+#include "cdecl-internal.h"
#include "parse.h"
#include "scan.h"
-#include "i18n.h"
-#include "normalize.h"
+#include "errmsg.h"
+
+/*
+ * We can represent type specifiers as a bitmap, which gives us a finite
+ * list of acceptable bitmap values according to the C standard. However,
+ * the "long" specifier is allowed to occur more than once, but only at most
+ * 2 times. Treat it as a special case, assigning an unused bit to represent
+ * the second long.
+ */
+#define MAP_LLONG_BIT 31
+#define MAP_LONG_BIT (CDECL_TYPE_LONG-CDECL_SPEC_TYPE)
+#define CDECL_TYPE_LLONG (CDECL_SPEC_TYPE+MAP_LLONG_BIT)
+
+#include "typemap.h"
+
+/*
+ * Convert the declaration specifiers to a bitmap with each bit
+ * corresponding to one specific type specifier.
+ */
+static int valid_typespec(struct cdecl_declspec *s)
+{
+ unsigned long map = 0;
+
+ for (struct cdecl_declspec *c = s; c; c = c->next) {
+ unsigned long bit;
+
+ if (cdecl_spec_kind(c) != CDECL_SPEC_TYPE)
+ continue;
+
+ bit = c->type - CDECL_SPEC_TYPE;
+ assert(bit < MAP_LLONG_BIT);
+ bit = 1ul << bit;
+
+ /* "long" special case */
+ if ((map & bit) == 1ul << MAP_LONG_BIT)
+ bit = 1ul << MAP_LLONG_BIT;
+
+ if (map & bit) {
+ if (bit == 1ul << MAP_LLONG_BIT)
+ cdecl__errmsg(CDECL__ETOOLONG);
+ else
+ cdecl__errmsg(CDECL__EDUPTYPE);
+ return false;
+ }
+ map |= bit;
+ }
+
+ if (typemap_is_valid(map))
+ return true;
+
+ if (map == 0)
+ cdecl__errmsg(CDECL__ENOTYPE);
+ else
+ cdecl__errmsg(CDECL__EBADTYPE);
+
+ return false;
+}
/*
* Verify the declaration specifiers of a declaration. If top is true, treat
struct cdecl_declarator *d = decl->declarators;
bool abstract = cdecl_is_abstract(d);
unsigned num_storage = 0;
- unsigned long typemap;
- typemap = cdecl__build_typemap(specs);
- if (typemap == -1)
+ if (!valid_typespec(specs))
return false;
for (struct cdecl_declspec *c = specs; c; c = c->next) {
if (c->type == CDECL_TYPE_VOID &&
(d->type == CDECL_DECL_IDENT
|| d->type == CDECL_DECL_ARRAY)) {
- fprintf(stderr, "invalid declaration of type void\n");
+ cdecl__errmsg(CDECL__EBADVOID);
return false;
}
continue;
case CDECL_SPEC_STOR:
if (top && abstract) {
- fprintf(stderr, "type names cannot have storage-class specifiers\n");
+ cdecl__errmsg(CDECL__ETYPESTOR);
return false;
}
if (!top && c->type != CDECL_STOR_REGISTER) {
- fprintf(stderr, "function parameters may only have register storage\n");
+ cdecl__errmsg(CDECL__EFUNCSTOR);
return false;
}
if (++num_storage > 1) {
- fprintf(stderr, "too many storage-class specifiers\n");
+ cdecl__errmsg(CDECL__EMANYSTOR);
return false;
}
break;
* pointer qualifier list, which isn't checked here.
*/
if (c->type == CDECL_QUAL_RESTRICT) {
- fprintf(stderr, "only pointer types can be restrict-qualified.\n");
+ cdecl__errmsg(CDECL__EBADQUAL);
return false;
}
break;
case CDECL_SPEC_FUNC:
- if (abstract) {
- fprintf(stderr, "type names cannot have function specifiers\n");
+ if (abstract || !top || d->type != CDECL_DECL_FUNCTION) {
+ cdecl__errmsg(CDECL__ENOTFUNC);
return false;
}
- if (!top || d->type != CDECL_DECL_FUNCTION) {
- fprintf(stderr, "only function declarations may have function specifiers.\n");
- return false;
- }
break;
default:
assert(0);
* if a declarator could be interpreted as something other than a function,
* do that.
*
- * - The function declarator has a null child declarator.
- * - The function declarator has exactly one parameter, and is not variadic.
- * - The function parameter has a type specifier, and it is a typedef name.
- * - The function parameter has no other declaration specifiers.
- * - The function parameter does not declare an identifier.
- *
* Since cdecl99 supports things like [*] in any context (in C, such constructs
* are only valid in function parameter lists), we don't treat them specially
* here.
return false; /* e.g. int (int) */
if (d->u.function.parameters->specifiers->next)
return false; /* e.g. int (size_t const) */
+ if (d->u.function.parameters->declarators->type == CDECL_DECL_POINTER)
+ return false; /* e.g. int (x *) */
return true;
}
}
if (d->child->type != CDECL_DECL_NULL) {
- fprintf(stderr, "invalid function parameter\n");
+ cdecl__errmsg(CDECL__EBADPARAM);
return -1;
}
if (decl->type == CDECL_DECL_FUNCTION
&& decl->child->type == CDECL_DECL_NULL
&& !function_is_reducible(decl)) {
- fprintf(stderr, "too many parentheses in function\n");
+ cdecl__errmsg(CDECL__EMANYPAREN);
return -1;
}
{
struct cdecl_declspec *spec;
struct cdecl *param;
- bool has_void = false;
if (d->type != CDECL_DECL_FUNCTION)
return 0;
continue;
if (spec != param->specifiers || spec->next != NULL) {
- fprintf(stderr, "void parameter must not have extra specifiers\n");
+ cdecl__errmsg(CDECL__EVOIDPARAM);
return -1;
} else if (d->u.function.parameters->next) {
- fprintf(stderr, "a void parameter must stand alone\n");
+ cdecl__errmsg(CDECL__EVOIDPARAM);
return -1;
} else if (d->u.function.variadic) {
- fprintf(stderr, "variadic functions cannot have a void parameter\n");
+ cdecl__errmsg(CDECL__EVOIDPARAM);
return -1;
}
}
switch (d->type) {
case CDECL_DECL_FUNCTION:
- fprintf(stderr, "functions cannot return functions\n");
+ cdecl__errmsg(CDECL__ERETFUNC);
return -1;
case CDECL_DECL_ARRAY:
- fprintf(stderr, "functions cannot return arrays\n");
+ cdecl__errmsg(CDECL__ERETARRAY);
return -1;
}
switch (d->type) {
case CDECL_DECL_FUNCTION:
- fprintf(stderr, "array members cannot be functions\n");
+ cdecl__errmsg(CDECL__EFUNCARRAY);
return -1;
}
return 0;
}
+static int
+check_qualifiers(struct cdecl_declarator **p, struct cdecl_declarator *d)
+{
+ struct cdecl_declspec *spec;
+ struct cdecl_pointer *ptr;
+
+ if (!d->child || d->child->type != CDECL_DECL_POINTER)
+ return 0;
+
+ ptr = &d->child->u.pointer;
+ for (spec = ptr->qualifiers; spec; spec = spec->next) {
+ if (spec->type == CDECL_QUAL_RESTRICT
+ && d->type == CDECL_DECL_FUNCTION) {
+ cdecl__errmsg(CDECL__ERESTRICTFUNC);
+ return -1;
+ }
+ }
+
+ return 0;
+}
+
/*
* Traverse the parse tree, calling a function on every declarator in a
* depth-first preorder traversal. The function is given a pointer to the
return true;
}
-struct cdecl *cdecl_parse_decl(const char *declstr)
+static struct cdecl *do_parse(const char *str, int english_mode)
{
- struct cdecl_declspec *norm_specs;
YY_BUFFER_STATE state;
yyscan_t scanner;
struct cdecl *decl;
- int rc;
- cdecl__init_i18n();
+#if YYDEBUG
+ extern int cdecl__yydebug;
+ cdecl__yydebug = 1;
+#endif
- rc = cdecl__yylex_init(&scanner);
- if (rc != 0)
+ cdecl__init_i18n();
+ if (cdecl__yylex_init_extra(english_mode, &scanner) != 0)
return NULL;
- state = cdecl__yy_scan_string(declstr, scanner);
- rc = cdecl__yyparse(scanner, &decl);
+ state = cdecl__yy_scan_string(str, scanner);
+ if (cdecl__yyparse(scanner, &decl) != 0)
+ decl = NULL;
cdecl__yy_delete_buffer(state, scanner);
cdecl__yylex_destroy(scanner);
- if (rc != 0)
+ return decl;
+}
+
+struct cdecl *cdecl_parse_decl(const char *declstr)
+{
+ struct cdecl_declspec *norm_specs;
+ struct cdecl *decl;
+
+ if (!(decl = do_parse(declstr, false)))
return NULL;
/*
* new specifier list.
*/
norm_specs = cdecl__normalize_specs(decl->specifiers);
-
for (struct cdecl *i = decl; i; i = i->next) {
i->specifiers = norm_specs;
+ }
+ /* Now perform checks and simplifications on each declarator. */
+ for (struct cdecl *i = decl; i; i = i->next) {
if (!forall_declarators(i, reduce_parentheses))
goto err;
if (!forall_declarators(i, simplify_functions))
goto err;
if (!forall_declarators(i, normalize_specs))
goto err;
+ if (!forall_declarators(i, check_qualifiers))
+ goto err;
if (!valid_declspecs(i, true))
goto err;
if (cdecl_is_abstract(i->declarators)
&& (i != decl || i->next)) {
- fprintf(stderr, "mixing type names and declarations is not allowed\n");
+ cdecl__errmsg(CDECL__EDECLTYPE);
goto err;
}
}
struct cdecl *cdecl_parse_english(const char *english)
{
- YY_BUFFER_STATE state;
- yyscan_t scanner;
struct cdecl *decl;
- int rc;
- cdecl__init_i18n();
-
- rc = cdecl__yylex_init_extra(true, &scanner);
- if (rc != 0)
- return NULL;
-
- state = cdecl__yy_scan_string(english, scanner);
- rc = cdecl__yyparse(scanner, &decl);
- cdecl__yy_delete_buffer(state, scanner);
- cdecl__yylex_destroy(scanner);
-
- if (rc != 0)
+ if (!(decl = do_parse(english, true)))
return NULL;
for (struct cdecl *i = decl; i; i = i->next) {
goto err;
if (!forall_declarators(i, normalize_specs))
goto err;
+ if (!forall_declarators(i, check_qualifiers))
+ goto err;
if (!valid_declspecs(i, true))
goto err;
projects / cdecl99.git / blobdiff